Programming Basics

Essential programming concepts and fundamentals

Variables

javascript

Variable declaration and scoping

// let - block scoped, can be reassigned
let count = 0;
count = 1;

// const - block scoped, cannot be reassigned
const PI = 3.14159;

// var - function scoped (avoid using)
var name = 'John';

Data Types

javascript

Common data types in programming

// Numbers
const integer = 42;
const float = 3.14;

// Strings
const text = 'Hello';

// Booleans
const isActive = true;

// Arrays
const numbers = [1, 2, 3];

// Objects
const user = {
  name: 'John',
  age: 30
};

Control Flow

javascript

Basic control flow statements

// If statement
if (condition) {
  // code
} else if (otherCondition) {
  // code
} else {
  // code
}

// For loop
for (let i = 0; i < 5; i++) {
  console.log(i);
}

// While loop
while (condition) {
  // code
}